Unfortunately you aren’t allowed to take footage of the demo being show of Colonial Marines at E3 but written previews of the demo are starting to come out:

“In a live gameplay demo, we got a chance to see many familiar elements from the movie. It opens with a ship crashing onto the surface of LB-426. The player comes to with a fellow Marine asking if he’s all right. The response is a quick middle finger.

The Marines start sweeping the area, walking through the medical bay with tubes of facehuggers suspended in fluid. A tracker starts pinging its familiar sound, though it doesn’t detect anything. For now. After a few moments, the squad comes upon a reinforced steel door that’s been torn open by something with obvious strength. After walking into a ruined operations area, a member of the squad screams as a xenomorph tears through the ceiling and attacks.”

Good questions from the interviewer. Sounds like co-op mechanics will be limited but still looking good to me. The WiiU business keeps getting more intersting. The talk about the sentry gun feedback being on the WiiU controller sounded cool, especially if you could see a little camera from the gun POV as it engaged aliens. That would be sick!!!

If those rumors of the Wii U turn out to be true, that will be the second Nintendo console I'll buy for a specific game.

Good questions from the interviewer. Sounds like co-op mechanics will be limited but still looking good to me. The WiiU business keeps getting more intersting. The talk about the sentry gun feedback being on the WiiU controller sounded cool, especially if you could see a little camera from the gun POV as it engaged aliens. That would be sick!!!

As I am late to the previews and can't be bothered to read threw all in one go, what are the general positives that the journalists mention, and what are the worse?

Previews have been all over the board, but general pros are the atmosphere (most said very similar to Aliens) including the lighting, the xenomorphs themselves, the drop in/out co-op, the standoff scenes, and the ominous return to the Sulaco and LV-426. The marines were also praised for being foul-mouthed and realistic, bringing back a lot of that special Apone magic. Sentry guns are in, as well as door welding (but only mentioned in one preview.)

The crusher is new, sounds/looks like a sort of Praetorian that rams the marines and is bulletproof. I think the given explanation for this variant was the heavy radiation contamination from the atmosphere processor. Power loaders are also playable, and the marines apparently weld flamethrowers and pulse rifles to the arms.

Also 3 acts confirmed, Sulaco, Hadley's Hope, and Derelict (!)

Weren't really a lot of cons, and some of the previews were rather strange as they dinged the game on things other previews had praised it over. Mostly just early development issues and bugs, but I don't remember reading anything really negative.

More links added to the main post (probably the last time I update it). Also ACM got a small mention at an interview by Gamesindustry.

Quote

Q: What are you impressions of E3 this year, of the three platform holders?

Mike Hayes: (...) And as you know, Sega's reasonably close to Nintendo, so again, we had the first look on Wii U. With Aliens: Colonial Marines we've actually been using the controller, but because we were the only third party that has something working it was decided not show that, quite rightly (...)

(...) And then I think for us the thing we're most thrilled about is Aliens: Colonial Marines, on the basis that we announced that quite a few years ago and we made a decision to craft it and spend more time with Gearbox, and I think we've been proven right by the response we've had at the show.

Q: It's one of the busiest demos on the show floor.

Mike Hayes: Yeah, and for us, Sega's quite a broad church of games, I think Aliens is definitely the core franchise that will do best for us as a company. And the response that we've had has just been absolutely second to none. So that's good for us.

Yeah usually wikipedia is pretty current, at least within days, but who knows with the more obscure topics like year-away video games being developed. How much manpower must they have? Is their a massive warehouse full of wikipedia researchers that constantly update and expand the site all day? It sounds tiring, but it's very interesting, and I appreciate the site.

Still I'm really excited for the lighting. I wasn't before, I guess I didn't really think about it but the movies had so many memorable scenes with great lighting, it makes me think we'll get a visual Aliens experience on par with the movies.

Yep! I love the Praetorians too. Alien games need variety. It's REALLY boring fight the same enemies over and over again... personaly i would love to see a giant alien-spider in the game

Oh no, you didn't.

It's boring to fight the same Aliens with the same AI again and again.

AvP2 had Aliens that just ran after you no matter what. (Not just the Aliens). There were moments when the Aliens to tricked you, but that was scripted.AvP2010 had Aliens that spawned, jumped and tried to attack you with their claws in mid-air, just to die for lulz.

This game offers intelligent Aliens that can be appropriate challenges, instead of horrendous Aliens emerging from horrendous animals/ideas.

It only needs to fit the internal logic of the game. And it looks like a reasonably Winston studios-esque kind of a thing - I don't mind it as an addition at all. Praetorians are a game construct too, and no-one seems to have too much of a problem with them now.

Why aren't people liking it? If THAT is the Crusher then its essentially a quadruped Praetorian, if that is a Praetorian than at least it looks like a Praetorian. I am just happy it still has the biomechanical look and isnt just a big "fat" Xenomorph. Obviously I am still not a big fan of the radiation reasoning behind it but at least its not because of humans tampering with the Xenos or some other lame explanation. Radiation >>>>> Human Tampering